Analog Devices Inc. ADM6328-26ARTZ-R7

Overview

ADM6328-26ARTZ-R7 from Analog Devices is an ultralow-power, open-drain microprocessor reset circuit in a 3-lead SOT-23 package, designed to monitor 2.63 V supply rails with ±2.5% threshold accuracy over −40°C to +85°C. It asserts an active-low RESET signal within 20 µs of VCC falling below threshold, holds reset for ≥100 ms on power-up, and operates down to 1.0 V VCC - enabling reliable startup and brownout protection in portable microprocessor systems.

For engineers reviewing the ADM6328-26ARTZ-R7 datasheet, ADM6328-26ARTZ-R7 pinout, ADM6328-26ARTZ-R7 application, or ADM6328-26ARTZ-R7 equivalent, key selection criteria include its 1 µA max supply current, open-drain output requiring external pull-up, 2.63 V reset threshold with 6.3 mV hysteresis, and guaranteed operation across industrial temperature range - all critical for low-power embedded reset supervision.

Technical Context

The ADM6328-26ARTZ-R7 implements a precision bandgap-based voltage reference and comparator to detect VCC drops below its factory-trimmed 2.63 V threshold. Its internal 100 ms minimum reset timeout timer ensures stable system initialization before release from reset.

As an open-drain device, it interfaces directly with bidirectional microprocessor reset pins using a single external pull-up resistor, supporting shared reset bus architectures. Glitch immunity rejects negative-going VCC transients up to 200 mV overdrive for durations under 1 µs, preventing spurious resets during supply noise.

Key Specifications

Pinout & Package

ADM6328-26ARTZ-R7 is housed in a JEDEC-compliant 3-lead SOT-23-3 (RT-3) package with 270°C/W junction-to-ambient thermal resistance, optimized for space-constrained PCB layouts and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset supervision applications.

Compared with MAX6326M26D3+T and TPS3808G26DBVR, ADM6328-26ARTZ-R7 delivers the lowest ICC (1.0 µA max) and tightest threshold tolerance (±2.5%) in open-drain configuration - making it optimal for space- and power-constrained portable designs requiring shared reset bus support.

Availability

ADM6328-26ARTZ-R7 is available at Aetrix Electronics and suitable for telecommunications baseband modules, industrial microcontroller systems, and portable medical sensors requiring stable component supply with RoHS-compliant packaging and long-term lifecycle assurance.

Supply support for ADM6328-26ARTZ-R7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets since 1965.

The ADM6328 series belongs to Analog Devices' precision voltage supervisor product line, engineered specifically for ultralow-power, high-accuracy reset generation in battery-powered and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of ADM6328-26ARTZ-R7 and how tightly is it specified?

The ADM6328-26ARTZ-R7 has a nominal reset threshold of 2.63 V at 25°C, with guaranteed tolerance of ±2.5% over the full −40°C to +85°C operating range. Per Table 2 in the datasheet, the actual min/max values are 2.564 V (min) and 2.696 V (max) across temperature - ensuring robust detection of 2.6 V rail faults without false triggering.

Does ADM6328-26ARTZ-R7 require an external pull-up resistor, and why?

Yes, ADM6328-26ARTZ-R7 requires an external pull-up resistor on its open-drain RESET pin because it only actively pulls low and cannot drive high. This design enables wired-OR reset bus configurations and compatibility with bidirectional microprocessor reset pins - a key feature confirmed in the Functional Block Diagram (Figure 2) and Theory of Operation section.

What is the minimum VCC voltage at which ADM6328-26ARTZ-R7 continues to assert RESET reliably?

ADM6328-26ARTZ-R7 guarantees valid RESET assertion down to VCC = 1.0 V, as stated in the General Description and Specifications table. This allows it to maintain system reset integrity during deep brownout events where other supervisors may lose functionality - critical for fail-safe behavior in safety-critical applications.

How does ADM6328-26ARTZ-R7 achieve immunity to power supply glitches?

ADM6328-26ARTZ-R7 achieves glitch immunity through internal circuitry that rejects negative-going VCC transients up to 200 mV overdrive for pulse widths under 1 µs, as characterized in Figure 5 of the datasheet. This prevents spurious resets caused by switching noise, ESD coupling, or load-step transients without requiring external filtering components.

Is ADM6328-26ARTZ-R7 compatible with standard SOT-23-3 PCB footprints and reflow profiles?

Yes, ADM6328-26ARTZ-R7 uses the JEDEC-standard SOT-23-3 (RT-3) package with documented outline dimensions in Figure 10. Its thermal resistance (θJA = 270°C/W) and maximum soldering temperature (300°C for 10 sec) align with IPC/JEDEC reflow guidelines - ensuring compatibility with standard automated assembly processes.